1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
GaryK [48]
3 years ago
15

How many valence electrons does the neutral Mg atom have?

Chemistry
2 answers:
Harrizon [31]3 years ago
8 0
Magnesium is element 12 and belongs to Group 2 of the Periodic Table. An element in Group 2 has two valence electrons. Also, the electron configuration of Mg is 1s² 2s²2p⁶ 3s² or [Ne]3s². Since the 3s² electrons are the outermost electrons, magnesium has two valence electrons.23 dic. 2014
Zanzabum3 years ago
7 0

Answer:

2 valence electrons

Explanation:

You might be interested in
Given 3.4 grams of x compound with a molar mass of 85 g and 4.2 grams of y compound with a molar mass of 48 g How much of compou
Ulleksa [173]

Answer:

4.36~g~XY

Explanation:

In this case, we can start with the reaction:

2X + Y_2~->~2XY

If we check the reaction, we will have 2 X and Y atoms on both sides. So, <u>the reaction is balanced</u>. Now, the problem give to us two amounts of reagents. Therefore, we have to find the <u>limiting reagent</u>. The first step then is to find the moles of each compound using the <u>molar mass</u>:

3.4~g~X\frac{1~mol~X}{85~g~X}=0.04~mol~X

4.2~g~Y_2\frac{1~mol~Y_2}{48~g~Y_2}=0.0875~mol~Y_2

Now, we can <u>divide by the coefficient</u> of each compound (given by the balanced reaction):

\frac{0.04~mol~X}{1}=~0.04

\frac{0.0875~mol~Y_2}{2}=0.04375

The smallest value is for "X", therefore this is our <u>limiting reagent</u>. Now, if we use the <u>molar ratio</u> between "X" and "XY" we can calculate the moles of XY, so:

0.04~mol~X\frac{2~mol~XY}{2~mol~X}=0.04~mol~XY

Finally, with the molar mass of "XY" we can calculate the grams. Now, we know that 1 mol X = 85 g X and 1 mol Y_2 = 48 g Y_2 (therefore 1 mol Y = 24 g Y). With this in mind the <u>molar mass of XY</u> would be 85+24 = 109 g/mol. With this in mind:

0.04~mol~XY\frac{109~g~XY}{1~mol~XY}=4.36~g~XY

I hope it helps!

6 0
3 years ago
If you have 85g of sulfur dioxide at STP, how many moles do you have?
Step2247 [10]

Answer: 1.32

Explanation:

Given

85 gm of sulfur dioxide is present at STP

The molar mass of sulfur dioxide is 32+2\times 16=64\ g/mol

The number of moles of sulfur dioxide is

\Rightarrow n=\dfrac{85}{64}\\\\\Rightarrow n=1.32\ \text{mol}

3 0
3 years ago
Why potassium by sulphite or KHSO4 donot preserve meat
Debora [2.8K]

Answer:

Postassium bisulphate - KHSO4 - can be used as an food preservative to protect the food from micro-organisms.

4 0
3 years ago
Find the kinetic energy of a boy of mass 6.5kg running at a velocity of 6.0m/s​
ololo11 [35]

Explanation:

Given,

M=6.5kg,velocity(v)=6m/s

K.E=1/2mv^2

=1/2×6.5×6^2

=1/2×6.5×36

=18×6.5

=117 J

3 0
2 years ago
คำถามตามในรูปครับ หาค่า half-equation EMF...
Lesechka [4]
It’s Thai right? I want to help but don’t know how to answer this question.
4 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone help me I need to convert the following...
    8·1 answer
  • Gravitational force is stronger between objects with less mass.<br><br> True or false?
    15·1 answer
  • HELP PLEASE. STRUGGLING. Which of the following is true in an acidic solution? A)The molarity of hydroxide is double the molarit
    10·1 answer
  • Which of the following types of radiation can be shielded by piece of paper or fabric
    9·1 answer
  • An atom of sodium has 11 protons, 11 electrons,and 12 neutrons, what is its atomic number and mass number?
    10·1 answer
  • NH_{4}Cl and NaCl<br> Balanced Equation<br> Total Ionic Equation<br> Net Ionic Equation
    12·1 answer
  • Which is a physical property of matter?
    8·1 answer
  • a student takes three beakers and places 250 ml of water in each. the student then adds a cube of sugar to all three beakers. th
    13·2 answers
  • Pls help need it now as I don't know the answer
    15·2 answers
  • Can mixtures and compounds be separated into their elements? If so which?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!